JOHN MARVIN WILLIS
Pilots at Waggoner Dr, Arlington, TX
License number
Texas A2072209
Category
Airmen
Type
Authorized Aircraft Instructor
Address
Address
713 Waggoner Dr, Arlington, TX 76013
Professional information
Electrical Detection Of Shear Pin Operation
US Patent:
5017912, May 21, 1991
Filed:
Oct 17, 1989
Appl. No.:
7/422641
Inventors:
John M. Willis - Arlington TX
Assignee:
Bell Helicopter Textron Inc. - Fort Worth TX
International Classification:
G08B 2100
US Classification:
340679
Abstract:
A shear detection circuit includes a resistive element in series with another resistor for providing an electrical signal at a node proportional at the value of the resistors when a voltage potential is applied to the detection circuit. The electrical signal is compared to a known value to permit detection of a severed shear pin or an open or short circuit in the detection circuit. The electrical signal is monitored by a computer for displaying the status of the shear pin and the detector circuit and for storing the status of the shear pin and the shear detection circuit for maintenance or repair.